Combine all ingredients for the sauce in a bowl and whisk to combine. Set aside.
In a large bowl, stir together the cornstarch and salt. Add the chicken and toss together until the chicken is coated evenly.
Preheat the air fryer to 400 degrees F, and generously spray the tray or basket with cooking oil. Add the chicken in a single layer without touching each other, spray again lightly and air fry for 14-16 minutes, flipping halfway through until golden and crispy. You may need to do this in more than one batch.
While the chicken is in the air-fryer, heat a large saucepan over medium high heat.
Pour in the prepared sauce and let it come to a boil while whisking. Simmer for 1-2 minutes until the sauce is thickened.
Turn off heat, and add the air-fried chicken to the saucepan and toss to coat in sauce.
Serve over white rice and garnish with sliced scallions and sesame seeds.